Gauged saw side file



Jan. 28, 1941. E. c. TUGGLE GAUGED SAW SIDE FILE Filed NaICh 4, 1940 FIG. 5

l//l/l//l INVENTOR:

Patented Jan. 28, 1941 UNirso TENT QFFEC 1 Claim.

This invention relates to a file.

The object of this invention is to provide a gauged file that will shape on the tips of shearing teeth, on the side set away from the edge of the saw, small planes parallel to and slightly off-set from the planes of the sides of th'e sawplanes that are in alinement in almost microscopio exactness on each side of the saw. This le can be used also to aline inserted teeth of circle saws; a style of le being made for each sort of saw. The very close alinement insured by the proper use of this le causes a saw to saw faster and easier; and causes it to cut a smoother kerf; which kerf, in the case of lumber sawed out by the larger circle saws, insures less waste in planing the lumber down.

This invention will best be understood by considering the following detailed description of it in View of the accompanying drawing, which drawing is to form a part of the specification; nevertheless, it is to be understood that the invention is not to be confined to the disclosure, being susceptible to such changes and modifications as shall define no material departure from 25 the salient features of the invention as expressed in the specification and claim.

In the drawing:

Figure 1 is a longitudinal plan view of a file made in accordance with the principles of my invention. Figure 2 is the elevation, and Figure 3 is the bottom view.

Figures 4 and 5 show how the file is held on the side of the saw when ling. Figure 6, 6a and 6b show in detail how a tooth is side-filed. Fig- 35 ure 7 shows the relative position of the le to the side of the saw blade when the le is in position for ling oil the sides of tips, looking from end of blade.

The same number designates the same part in 40 all figures. The number I designates teeth on the under side of the le. I9 designates on the bottom of the file a surface that is smooth within the limits of 3. 20 designates the front edge of this surface, and this edge should be slightly rounded or beveled to prevent scarring tips of saw teeth in case it should be pushed over them in the forward stroke. 2 designates a line in a horizontal plane with the plane of I8. ll designates a line in a horizontal plane with the edges of the teeth within the limits of This plane of the edges of the teeth within the limits of '5 and the plane of I9 must be parallel and slightly separated, the degree of their separation depending on the sort of saw the le is to be made to be used on. The edges of the teeth on the end of the le, as indicated within the limits of 6, may be in plane inclined upward from the plane of the teeth within the limits of 5.

The number 'I designates a partial loop bent on the rear end of the file, to allow a fore-finger 5 to be thrust through to hold the l'lle when using it, as at 8 in Figures 4 and 5. The edges of this loop may be rounded, as indicated at 9, to make grasping it easier on the fore-finger.

The number I0 designates on the top side of 10 the file a depression conforming to the contours of the ball of the thumb, to enable the thumb better to press the file against the side of the saw and hold the file in line with the tooth it is being used on; as indicated at II in Figures 4 15 and 5.

How this file is used to aline the tips of shearing teeth on each side of a saw; orto aline the inserted teeth of circle saws, might be best understood by considering a detailed description of how it is used to strike on the tip of a single tooth:

Figure 6 shows three views, greatly enlarged, ofa tip of a two-man cross-cut saw tooth so struck off. I2 designates a linev on which the end of the tooth is rst bent away from the edge of the blade to give to the tooth its set. I3 designates a line in the vertical plane of the side of the blade. I4 and I5 indicate the side set away from the edge of the saw before I5 was led off 30 to get the off-set and parallel surface I 8; this filing being done by back-and-forth strokes over the tip on its set side, as indicated at I 6 and I'I in Figure 4 and as indicated at I8 in Figures 4 and 7. one by one, the sides of the tips of au 35 shearing teeth setto the same side of the saw are so filed 01T in alinement. The sides of inserted teeth of circle saws, near the tips, are filed off in alinement in a similar manner.

The teeth on cross-out saws and rip saws- 40 hands saws, one and two-man saws, band saws and circle saws-may be so alined on their sides.

This file is about four inches long and threequarters of an inch wide; but these dimensions are susceptible to variation, of course.

The fundamental characteristic of my file is the off-set of the edges of the teeth from the smooth part of the bottom;v this arrangement constituting a gauge file,` by the use of which even a semi-skilled mechanic can give a perfect alinement to the sides of shearing saw teeth; this off-set being susceptible to varying to suit the sort of saw the file is made for use on.

I claim:

A gauged saw side le, made of tempered steel,

comprising a partial loop on its rear end for a fore-finger hold; a bottom surface that is smooth and in a plane parallel to and slightly off-set from the plane of the edges of the filing teeth, this bottom surface having a rounded or beveled edge at its frontal limits to prevent its scarring, on saw tips; teeth on a part of the under surface, the teethexcept on the front end of the le, where the plane of their edges Vslant upwardl0 being in a plane parallel to and slightly off-'set 

